None of the above,
Give us an idea of what you want to spend and what you are planning to do. We would be happy to recommend the hardware that would be best for your needs.
Take Care,
Richard
P.S. This is a good start:
Building Your Own PC, Part 1 Know-How for Do-It-Yourselfers
and
Building Your Own PC, Part 2: Assembly Step by Step
and
Do-It-Yourself PC System: CPU & Motherboard